Collimation and homogenization system for an led luminaire

ABSTRACT

Disclosed is an LED light source automated luminaire with a multi sided elongated light collimator/mixer/integrator with receiving lens and output lens both with spill shields and where the receiving spill shield is nesting in the output spill shield. The elongated integrator has a square input cross-section and a hexagon or octagon output cross section and is tapered so that the input cross section is smaller than the output cross section.

RELATED APPLICATION

The present application claims priority to provisional application62/058,566 filed 1 Oct. 2014.

TECHNICAL FIELD OF THE INVENTION

The present invention generally relates to a method for controlling thelight output from an array of LEDs when used in a light beam producingluminaire, specifically to a method relating to improving thehomogenization and collimation of the LEDs and for controlling the beamangle of the array.

BACKGROUND OF THE INVENTION

Luminaires with automated and remotely controllable functionality arewell known in the entertainment and architectural lighting markets. Suchproducts are commonly used in theatres, television studios, concerts,theme parks, night clubs and other venues. A typical product willtypically provide control over the pan and tilt functions of theluminaire allowing the operator to control the direction the luminaireis pointing and thus the position of the light beam on the stage or inthe studio. This position control is often done via control of theluminaire's position in two orthogonal rotational axes usually referredto as pan and tilt. Many products provide control over other parameterssuch as the intensity, color, focus, beam size, beam shape and beampattern. Additionally it is becoming common to utilize high power LEDsas the light source in such luminaires and, for color control, it iscommon to use an array of LEDs of different colors. For example a commonconfiguration is to use a mix of Red, Green and Blue LEDs. Thisconfiguration allows the user to create the color they desire by mixingappropriate levels of the three colors. For example illuminating the Redand Green LEDs while leaving the Blue extinguished will result in anoutput that appears Yellow. Similarly Red and Blue will result inMagenta and Blue and Green will result in Cyan. By judicious control ofthe LED controls the user may achieve any color they desire within thecolor gamut set by the LED colors in the array. More than three colorsmay also be used and it is well known to add an Amber or White LED tothe Red, Green and Blue to enhance the color mixing and improve thegamut of colors available. The products manufactured by Robe ShowLighting such as the Robin 600 LEDWash are typical of the art.

The differently colored LED dies may be arranged on packages in theluminaire such that there is physical separation between each color ofLED, and this separation, coupled with differences in die size for eachcolor, may affect the spread of the individual colors and results ininadequate mixing of the different colors along with objectionable spilllight and color fringing of the combined mixed color output beam. It iscommon to use a lens or other optical device in front of each LEDpackage to control the beam shape and angle of the output beam; howeverthese optical devices may have differing effect for different colors andcolor fringing or other aberrations may be visible in the output beam.It would be advantageous to have a system where stray light andaberrations are well controlled.

FIG. 1 illustrates a prior art system showing two LEDs in a package asmay be used in a luminaire. LED 2 and LED 4 may be of differing colorsand, due to the different optical properties and construction of the LEDdies 2, 4 produce light beams 6 and 8 that differ in beam spread. Thediffering beam spreads mean that the light beams from LEDs 2 and 4 willimpinge on an illuminated object 18 in such a way that areas 20 and 16of the object are illuminated by a single LED only rather than thedesired mix of both. This results in areas 120 and 16 being coloreddifferently from the central mixed area and appearing as coloredfringes. Only Two (2) LEDs are illustrated in FIG. 1 for clarity andsimplicity. It should be appreciated that the same problem exists withsystems incorporating more than two colors of LED.

FIG. 2 illustrates a typical multiparameter automated LED luminairesystem 10. These systems commonly include a plurality of multiparameterautomated luminaires 12 which typically each contain on-board an arrayof LEDs, and electric motors coupled to mechanical drives systems andcontrol electronics (not shown). In addition to being connected to mainspower either directly or through a power distribution system (notshown), each luminaire is connected is series or in parallel to datalink 14 to one or more control desk(s) 15. The luminaire system 10 istypically controlled by an operator through the control desk 15.Consequently, to affect this control, both the control desk 10 and theindividual luminaires typically include electronic circuitry as part ofthe electromechanical control system for controlling the automatedlighting parameters.

FIG. 3 and FIG. 4 illustrate an optical system used in the prior art toprovide a variable beam angle or zoom to an automated LED luminaire.Each LED 50 which may be fitted with a primary optic 52 has anassociated pair of lenses 53 and 55. Lenses 53 and 55 may be separatelenses or each part of an array of lenses covering the entire LED array.Lenses 53 and 55 may each comprise a single optical element 56 and 57respectively. In operation at least one of lens 53 or lens 55 isstationary with respect to LED 50 while the other may move along opticalaxis 59. In the example illustrated in FIGS. 3 and 4 lens 55 is fixedrelative to LED 50 while lens 53 is able to move along optical axis 59.FIG. 3 shows lens 53 in a first position and FIG. 4 shows lens 53 in asecond position closer to LED 50. This varying relative position betweenLED 50, lens 53 and lens 55 provides a beam angle or zoom to the lightbeam from LED 50. Such systems are often limited in their zoom range byoptical problems caused by the color separation and inadequate beamhomogenization. They may further be limited by requiring large movementsof the lenses.

This is a need for an optical system for an LED automated luminairewhich provides improved color homogenization and beam collimation whilealso providing improved zoom range.

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of the present invention and theadvantages thereof, reference is now made to the following descriptiontaken in conjunction with the accompanying drawings in which likereference numerals indicate like features and wherein:

FIG. 1 illustrates a prior art LED lighting system;

FIG. 2 illustrates a typical automated lighting system;

FIG. 3 illustrates optical components of a prior art LED luminaire;

FIG. 4 illustrates optical components of a prior art LED luminaire;

FIG. 5 illustrates optical components of an embodiment of the LEDluminaire;

FIG. 6 illustrates a front view of the collimating and mixing optic 80and LED 60 of FIG. 5;

FIG. 7 illustrates a front view of the light integrator 102 of FIG. 5;

FIG. 8 illustrates a further embodiment of the embodiment illustrated inFIG. 5;

FIG. 9 illustrates an alternative embodiment of the LED luminaire;

FIG. 10 illustrates a front view of the collimating and mixing optic 80and LED 60 of FIG. 5;

FIG. 11 illustrates a front view of the light integrator 102 of FIG. 5;

FIG. 12 illustrates a further embodiment of the embodiment illustratedin FIG. 5;

FIG. 13 illustrates an alternative embodiment of the LED luminaireillustrated in FIG. 5;

FIG. 14 illustrates an alternative embodiment of the LED luminaireillustrated in FIG. 9;

FIG. 15 illustrates an alternative embodiment of the LED luminaire withlight spill reducing element;

FIG. 16 illustrates an alternative embodiment of an optical element;

FIG. 17 illustrates an alternative embodiment of the optical element;

FIG. 18 illustrates an embodiment of the light integrator;

FIG. 19 illustrates an alternative embodiment of the light integrator;

FIG. 20 illustrates an embodiment of the light integrator fitted with agobo or pattern wheel;

FIG. 21 illustrates an alternative embodiment of the light integratorfitted with a gobo or pattern wheel;

FIG. 22 illustrates an alternative embodiment of the light integratorfitted with a gobo or pattern wheel;

FIG. 23 illustrates an embodiment of the light integrator fitted with agobo or pattern wheel;

FIG. 24 illustrates an embodiment of the light integrator fitted with astatic gobo or pattern wheel and a rotating gobo or pattern wheel;

FIG. 25 illustrates an example of a full static gobo wheel;

FIG. 26 illustrates an example of a full rotating gobo wheel;

FIG. 27 illustrates an alternative example of a full static gobo wheel;

FIG. 28 illustrates an example of a partial static gobo wheel;

FIG. 29 illustrates an embodiment of an array of light integrators ofthe invention, each fitted with a partial gobo wheel;

FIG. 30 illustrates an alternative embodiment of the light integratorfitted with a static gobo or pattern wheel and a rotating gobo orpattern wheel; and;

FIG. 31 illustrates an alternative embodiment of the light integratorfitted with a static gobo or pattern wheel and a rotating gobo orpattern wheel.

DETAILED DESCRIPTION OF THE INVENTION

Preferred embodiments of the present invention are illustrated in theFIGUREs, like numerals being used to refer to like and correspondingparts of the various drawings.

The present invention generally relates to a method for controlling thelight output from an array of LEDs when used in a light beam producingluminaire, specifically to a method relating to improving thehomogenization and collimation of the LEDs and for controlling the beamangle of the array.

FIG. 5 illustrates an embodiment of the optical system of the invention.LED 60, which may include a primary optic, is mounted on substrate 62.LED 60 may contain a single color die or may contain multiple dies, eachof which may be of differing colors. The light output from the dies inLED 60 enters collimating and mixing optic 80 at light entry port 82.Collimating and mixing optic 80 may be a solid optic using totalinternal reflection (TIR) to direct the light or may be a hollowreflective surface. Collimating and mixing optic 80 may have four sides86, each of which may be curved with cornered sides 92. The end view ofcollimating and mixing optic 80 in FIG. 6 combined with sideillustration of the collimating and mixing optic 80 in FIG. 5 illustratedetails an embodiment of the shape. The combination square sided shapewith curved sides provides excellent mixing of the light from the dies64 in LED 60. A further feature of collimating and mixing optic 64 isthat it directs the reflected light to an external focal point which iscomparatively close to its output port 84 of the collimating and mixingoptic 80.

In the embodiments illustrated in FIG. 6 the configuration of theplurality of LED dies 64 in LED 60 is square and aligned with the sides86 of the collimator 80. In other embodiments the alignment of the dieswith the collimator sides may not be aligned, for example as illustratedin FIG. 10. In alternative embodiments of those illustrated in FIG. 6and FIG. 10 the collimator may have a plurality of slides of three fouror more sides. In further embodiments the arraignment of the dies in theLED array may be configured in different shapes and paired withcollimators with matching or divergent shapes.

In different embodiments degree of curvature of the sides 86 mayvary—flatter for some configurations and more curved for otherconfigurations. Additionally, the sharpness of the corners 92 betweenthe sides may vary among different collimators—sharper for someconfigurations and rounder for others. The selection of the number ofsides and the curvature of the sides and curvature of the corners is/aretradeoffs between the degree of mixing desired and acceptable light lossfor a particular configuration or application.

In the embodiment shown in FIG. 5, the reflected light exits collimatingand mixing optic 64 at port 84 and enters light integrator optic 102 atits entry port 106. Light integrator 102 is a device utilizing internalreflection so as to collect, homogenize and constrain and conduct thelight from collimating and mixing optic 80. Light integrator 102 may bea hollow tube with a reflective inner surface such that light impinginginto the entry port may be reflected multiple times along the tubebefore leaving at the exit port 108. Light integrator 102 may be asquare tube, a hexagonal tube, a heptagonal tube, an octagonal tube, acircular tube, or a tube of any other cross section. In a furtherembodiment light integrator 102 may be a solid rod constructed of glass,transparent plastic or other optically transparent material where thereflection of the incident light beam within the rod is due to totalinternal reflection (TIR) from the interface between the material of therod and the surrounding air. The integrating rod may a square rod, ahexagonal rod, a heptagonal rod, an octagonal rod, a circular rod, or arod of any other cross section. Integrator embodiments with a polygonalcross section have reflective sides 110 and corners 112 between thereflective sides as seen in FIG. 5 which includes a side cross sectionalview of the integrator 102 and more easily seen in FIG. 7 a front exitport view of the integrator 102.

In a yet further embodiment the light integrator 102 may have a straightsided square cross section at the entrance port and a straight sidedpolygonal cross section with more than four sides at the exit port. Theexit port may be pentagonal, hexagonal, heptagonal, octagonal, or haveany other integral number of sides.

A feature of a light integrator 102 which comprises a hollow or tube orsolid rod where the sides of the rod or tube are essentially paralleland the entrance aperture 106 and exit aperture 108 are of the same sizeis that the divergence angle of light exiting the integrator 102 at exitport 108 will be the same as the divergence angle for light entering theintegrator 102 at entry port 106. Thus a parallel sided integrator 102has no effect on the beam divergence and will transfer the position ofthe focal point of collimating and mixing optic 80 at its exit aperture84 to the integrator's 102 exit aperture 108. The light exitingintegrator 102 will be well homogenized with all the colors of LED 60mixed together into a single colored light beam and may be used as ouroutput, or may be further modified by downstream optical systems.

Integrator 102 may advantageously have an aspect ratio where its lengthis much greater than its diameter. The greater the ratio between lengthand diameter, the better the resultant mixing and homogenization willbe. Integrator 66 may be enclosed in a tube or sleeve 104 which providesmechanical protection against damage, scratches, and dust.

FIG. 8 illustrates a further embodiment of the invention. Elements LED60, substrate 62, collimating and mixing optic 80, integrator 102, areas described above for FIG. 5, FIG. 6 and FIG. 7. In this embodiment thehomogenized and focused light exiting from integrator 66 is directedthrough lens system 120 and 122. Lenses 120 and 122 may be independentlymovable 124 and 126 along the optical axis so as to provide beam anglecontrol over the light beam. Because the focal point of collimating andmixing optic 80 is short, a small motion of lenses 120 and 122 may causea large change in beam angle. In one embodiment movements 124 126 of 10mm in the position of lenses 120 and/or 122 may cause a change in beamangle from 5° to 50°. Thus providing an improved variable beam angle orzoom to an automated LED luminaire.

In further embodiments, lenses 120 and 122 may form an achromaticoptical system such that it provides the same degree of beam anglechange to long wavelength red light as it does to short wavelength bluelight and thus avoids chromatic aberration. This ensures that the beamsfrom the different colors of LED dies 64 in LED 60 are all the same sizeresulting in a uniformly colored combined beam. In yet furtherembodiments any number of lenses may be used as the lens system. In allcases, lenses may contain one or more optical elements. Lenses 120 and122 are illustrated herein as bi-convex lenses however the invention isnot so limited and lenses 120 and 122 may be any shaped optical elementas well known in the art.

FIG. 9 illustrates an embodiment of the optical system of the invention.LED 60, which may include a primary optic, is mounted on substrate 62.LED 60 may contain a single color die 64 or may contain multiple dies64, each of which may be of differing colors. The light output from thedies 64 in LED 60 enters light integrator optic 102 at entry port 106.Light integrator 102 may be of the same construction and configurationas in the embodiment illustrated in FIG. 5. Light integrator 102 is adevice utilizing internal reflection so as to collect, homogenize andconstrain and conduct the light to the entry port 82 of collimating andmixing optic 80. Light integrator 102 may be a hollow tube with areflective inner surface such that light impinging into the entry port106 may be reflected multiple times along the tube before leaving at theexit port 108. Light integrator 102 may be a square tube, a hexagonaltube, a heptagonal tube, an octagonal tube, a circular tube, or a tubeof any other cross section. In a further embodiment light integrator 102may be a solid rod constructed of glass, transparent plastic or otheroptically transparent material where the reflection of the incidentlight beam within the rod is due to total internal reflection (TIR) fromthe interface between the material of the rod and the surrounding air.The integrating rod may a square rod, a hexagonal rod, a heptagonal rod,an octagonal rod, a circular rod, or a rod of any other cross section.

A feature of a light integrator 102 which comprises a hollow or tube orsolid rod where the sides of the rod or tube are essentially paralleland the entrance aperture 106 and exit aperture 108 are of the same sizeis that the divergence angle of light exiting the integrator 102 exitport 108 will be the same as the divergence angle for light entering theintegrator 102 at entry port 106 from LED 60. Thus a parallel sidedintegrator 102 has no effect on the beam divergence and will transferthe light from LED 60 to its exit aperture 108. The light exitingintegrator 102 will be well homogenized with all the colors of LED 60mixed together into a single colored light beam.

Integrator 102 may advantageously have an aspect ratio where its lengthis much greater than its diameter. The greater the ratio between lengthand diameter, the better the resultant mixing and homogenization willbe. Integrator 102 may be enclosed in a tube or sleeve 104 whichprovides mechanical protection against damage, scratches, and dust.

Light exiting integrator 102 at exit port 108 enters collimating andmixing optic 80 at its entry port 82. Collimating and mixing optic 80may be of the same construction and configuration as the collimating andmixing optic in embodiment illustrated in FIG. 5. Collimating and mixingoptic 80 may be a solid optic using total internal reflection (TIR) todirect the light or may be a hollow reflective surface. Collimating andmixing optic 80 may have four sides, each of which may be curved. Theside view of collimating and mixing optic 80 included in FIG. 9 and theend view of collimating and mixing optic 80 in FIG. 10 illustrate thedetail of this shape. The combination square sided shape with curvedsides provides further mixing of the light from the dies in LED 60 ashomogenized by integrator 102. A further feature of collimating andmixing optic 80 is that it directs the reflected light to an externalfocal point which is comparatively close to its output face.

In the embodiment shown in FIG. 9 the reflected light exits collimatingand mixing optic 80 at exit port 84 and may be used as our output, ormay be further modified by downstream optical systems.

FIG. 8 illustrates a further embodiment of the invention. Elements LED60, substrate 62, collimating and mixing optic 80, integrator 102, canbe as described above. In this embodiment the homogenized and focusedlight exiting from collimating and mixing optic 64 is directed throughlens system 120 and 122. Lenses 120 and 122 may be independently movablealong the optical axis so as to provide beam angle control over theexiting light beam. Because the focal point of collimating and mixingoptic 80 is short, a small motion of lenses 120 and 122 may cause alarge change in beam angle. In one embodiment a movement of 10 mm in theposition of lenses 120 and/or 122 may cause a change in beam angle from5° to 50°. Thus providing an improved variable beam angle or zoom to anautomated LED luminaire.

In further embodiments, lenses 120 and 122 may form an achromaticoptical system such that it provides the same degree of beam anglechange to long wavelength red light as it does to short wavelength bluelight and thus avoids chromatic aberration. This ensures that the beamsfrom the different colors of LED dies in LED 60 are all the same sizeresulting in a uniformly colored combined beam. In yet furtherembodiments any number of lenses may be used as the lens system. In allcases, lenses may contain one or more optical elements. Lenses 120 and122 are illustrated herein as bi-convex lenses however the invention isnot so limited and lenses 120 and 122 may be any shaped optical elementas well known in the art and may include any number of lenses includinga single lens. This applies to any of the embodiments discussed above

FIG. 13 and FIG. 14 illustrate further alternative embodiments of LEDluminaires. In both of these embodiments the light integrator 102,whether solid or hollow, has sides 110 which are tapered so thatentrance aperture 106 is smaller than the exit aperture 108. Theadvantage of this structure is that the divergence angle of lightexiting the integrator 102 at exit port 108 will be smaller than thedivergence angle for light entering the integrator 102 at entry port106. The combination of a smaller divergence angle from a largeraperture serves to conserve the etendue of the system. Thus a taperedintegrator 102 may provide similar functionality to a condensing opticalsystem. Therefore some embodiments may not include optical elements 120122 as discussed above while other embodiments may include such elementsas discussed above with regard to embodiments with non-taperedintegrators.

FIG. 15 illustrates a further alternative embodiment of LED luminaires.In this embodiment the light integrator 102, whether solid or hollow,and with any number of sides, or with a square entry port 106 and apolygonal exit port 108 has sides 110 which are tapered so that entranceaperture 106 is smaller than the exit aperture 108. The advantage ofthis structure is that the divergence angle of light exiting theintegrator 102 at exit port 108 will be smaller than the divergenceangle for light entering the integrator 102 at entry port 106. Thecombination of a smaller divergence angle from a larger aperture servesto conserve the etendue of the system. Thus a tapered integrator 102 mayprovide similar functionality to a condensing optical system. Thereforesome embodiments may not include optical elements 120 122 as discussedabove while other embodiments may include such elements as discussedabove with regard to embodiments with non-tapered integrators.Additionally this embodiment may alternately utilize lenses 130 and 132as optical elements providing condensing, beam angle control, andfocusing functionality as described above as a replacement for thecollimating and mixing optic used in earlier embodiments. Lenses 130 and132 may be meniscus lenses, plano convex lenses, bi-convex lenses, orother lenses as well known in the art. In the embodiment illustratedlens 130 is a plano-convex lens, and lens 132 is a meniscus lens.

FIG. 15 also shows optional spill reducing elements 131 and 133. Spillreducing elements 131 and 133 may comprise hollow opaque thin walledtubes which are attached to, and move with, optical elements 130 and 132respectively. These tubes reduce light spill from the exit port 108which may impinge on adjacent light integrators and their associatedoptical systems. Spill reducing element 131 may be of a smaller diameterthan spill reducing element 133 such that optical element 130 and itsattached spill reducing element 131 may move within spill reducingelement 133 such that optical elements 130 and 132 may move to beadjacent. An external further additional spill reducing element 135 mayalso be added to and may move with lens 132. Lenses 130 may be moved asshown by arrow 134, and lens 132 may be moved as shown by arrow 136.Such movement allows changing the focal length, and thus the beam angleof the output light beam. Lenses 130 and 132 may move together as a pairwith a single actuator, or, in a further embodiment, may moveindependently each with its own actuator.

FIG. 16 shows an alternative embodiment of the layout of the frontoptical elements of the system. In, for example FIG. 15, there is afront optical element 132 which forms the final output lens of thesystem. FIG. 16 shows a front view of four of the systems 204 shown inFIG. 15 mounted in a square array. In this embodiment the four opticalelements 162, 164, 166, and 168 in FIG. 16 each represent an identicalexample of element 132 in FIG. 15. Optical element 162 is constructed aspart of a larger, quadrant shaped, structure 172. Structure 172incorporating optical element 162 may be molded from a single piece ofglass or optical plastic. Similarly optical element 164 is incorporatedas part of quadrant 174, optical element 166 is incorporated as part ofquadrant 176, and optical element 168 is incorporated as part ofquadrant 178. The incorporation of the optical elements in to quadrantsprovides two desirable results. Firstly, four modules may be placed in asquare array while representing an unbroken and clean appearance fromthe front with the four quadrants joining to provide a complete circle.Secondly, any remaining spill light from the optical modules willdisperse and dissipate within the areas of the quadrants outside theoptical elements, providing an attractive light glow between the opticalelements.

FIG. 17 shows a further alternative embodiment of the layout of thefront optical elements of the system. In, for example FIG. 15, there isa front optical element 132 which forms the final output lens of thesystem. FIG. 16 shows a front view of four of the systems 204 shown inFIG. 15 mounted in a square array. In this embodiment the four opticalelements 182, 184, 186, and 188 in FIG. 17 each represent an identicalexample of element 132 in FIG. 15 molded into a quadrant shape. Theconfiguration of the optical elements as quadrants provides twodesirable results. Firstly, four modules may be placed in a square arraywhile representing an unbroken and clean appearance from the front withthe four quadrants joining to provide a complete circle. Secondly, anyremaining spill light from the optical modules will disperse anddissipate within the areas of the quadrants outside the opticalelements, providing an attractive light glow between the opticalelements.

FIG. 18 illustrates an embodiment of the light integrator 104 a of theinvention. In this embodiment entrance port 106 a is square incross-section and exit port 108 a is hexagonal in cross-section.

FIG. 19 illustrates an alternative embodiment of the light integrator104 b of the invention. In this embodiment entrance port 106 b is squarein cross-section and exit port 108 b is octagonal in cross-section.

In the alternative embodiments illustrated in FIGS. 20, 21, 22, and 23the optical system is further fitted with a gobo wheel system 150. Agobo wheel contains patterns or images that will controllably mask thelight exiting through port 84. These images will then be projected bydownstream optical elements to create a pattern projecting light beam.The lens system after the gobo wheel may be a zoom lens system 120 and122 such as shown in FIG. 20 or any other projecting lens system as wellknown in the art. Gobo wheel 154 may be rotated through motor 152 andshaft 153 in order to select different gobo patterns in front of exitaperture 84. Gobo wheel system 150 may incorporate a static gobo wheel,a rotating gobo wheel, or both. The static gobo wheel or rotating gobowheel may each be a full wheel, or a partial wheel.

FIG. 24 illustrates both a full static gobo wheel and a full rotatinggobo wheel as fitted to an embodiment of the invention. Gobo wheel 163may be rotated through motor 164 in order to select different gobopatterns in front of exit aperture 108. In yet further embodimentsindividual gobo patterns may be further rotated about their axes bysupplementary motors in order to provide a moving rotating image. Suchrotating gobo wheels are well known in the art. Rotating gobo wheel,165, is an example of such an embodiment. Rotating gobo wheel 165 may berotated through motor 166 in order to select different gobo patterns 168in front of exit aperture 108. Gobo patterns 168 may then be rotatedabout the optical axis of the system through motor 167.

FIG. 25 shows gobo wheel 163 in more detail in a further embodiment ofthe invention. Gobo wheel 163 contains a plurality of patternsincluding, for example, 172, 173, 174, 176, and 178 that may be movedacross and in front of the exit port of the light integrator by rotationabout motor 164. FIG. 26 shows rotating gobo wheel 165 in more detail ina further embodiment of the invention. Gobo wheel 165 contains aplurality of patterns including, for example, 182 that may be movedacross and in front of the exit port of the light integrator by rotationabout motor 166. These gobo patterns may then be rotated about theoptical axis of the system through motor 167. FIG. 27 shows gobo wheel150 in more detail in a further embodiment of the invention. Gobo wheel150 contains a plurality of patterns including, for example, 172, 173,174, 176, and 178 that may be moved across and in front of the exit portof the light integrator by rotation about motor 164.

In further embodiments the gobo wheel may not be a complete circulardisc as shown in FIG. 27, but may be a portion of a disc, or a flag soas to save space and provide a more limited number of gobo options. FIG.28 illustrates an embodiment of a partial gobo wheel where gobo wheel154 is a quadrant of a circle containing three gobos, 182, 184, and 186.Such an arrangement with a partial wheel facilitates embodiments such asthat illustrated in FIG. 29 where multiple light integrators areutilized in a single luminaire. Each of those light integrators may befitted with an independent gobo system 150, all or any of which may beindividually or cooperatively controlled. Utilizing partial wheels 154may allow a tighter packing density for the light integrators andoptical systems without interference between the adjacent wheels. In theexample illustrated nine light integrators and associated gobo systems150 are utilized in a circular arrangement. However, the invention isnot so limited and any number of light integrators in any arrangementmay be utilized without departing from the spirit of the invention.Additionally, it is not necessary that every light integrator is fittedwith a gobo system; embodiments may be constructed where a proportion ofthe light integrators is fitted with gobo systems, and a proportion isnot.

FIG. 30 illustrates both a full static gobo wheel and a full rotatinggobo wheel as fitted as gobo system 150 to an alternative embodiment ofthe invention. Gobo wheel 163 may be rotated through motor 164 in orderto select different gobo patterns in front of exit aperture 84. In yetfurther embodiments individual gobo patterns may be further rotatedabout their axes by supplementary motors in order to provide a movingrotating image. Such rotating gobo wheels are well known in the art.Rotating gobo wheel, 165, is an example of such an embodiment. Rotatinggobo wheel 165 may be rotated through motor 166 in order to selectdifferent gobo patterns 168 in front of exit aperture 108. Gobo patterns168 may then be rotated about the optical axis of the system throughmotor 167.

FIG. 31 illustrates both a full static gobo wheel and a full rotatinggobo wheel as fitted as gobo system 150 to a preferred embodiment of theinvention. Gobo wheel 163 may be rotated through motor 164 in order toselect different gobo patterns in front of exit aperture 108. In yetfurther embodiments individual gobo patterns may be further rotatedabout their axes by supplementary motors in order to provide a movingrotating image. Such rotating gobo wheels are well known in the art.Rotating gobo wheel, 165, is an example of such an embodiment. Rotatinggobo wheel 165 may be rotated through motor 166 in order to selectdifferent gobo patterns 168 in front of exit aperture 108. Gobo patterns168 may then be rotated about the optical axis of the system throughmotor 167.

In all embodiments both the static and rotating gobo patterns may be ofany shape and may include colored images or transparencies. Additionallyeffects such as prisms, lenticular lenses, or break up glasses may beused without departing from the spirit of the invention. Fort example,the use of a lenticular lens may provide an elliptical beam from eachlight integrator and rotating that lenticular lens may rotate theelliptical beam about its optical axis. Cooperatively or independentlyrotating such lenticular lenses on a luminaire with multiple lightintegrators such as that illustrated in FIG. 29, may provide new dynamiclighting effects for the operator.

While the disclosure has been described with respect to a limited numberof embodiments, those skilled in the art, having benefit of thisdisclosure, will appreciate that other embodiments may be devised whichdo not depart from the scope of the disclosure as disclosed herein. Thedisclosure has been described in detail, it should be understood thatvarious changes, substitutions and alterations can be made heretowithout departing from the spirit and scope of the disclosure.

What is claimed is:
 1. Automated luminaire with multiple LED sourcesfeeding light into and elongated integrator the output of which feedslight to a gobo carrier which carries a plurality of gobo light patternsto a receiving lens protected by an elongated spill shield the receivinglight in-turn feeding light to an output lens also protected by anelongated spill shield.
 2. The automated luminaire of claim 1 where thereceiving lenses spill shield is nested in the output lenses spillshield.
 3. The automated luminaire of claim 1 where the elongated lightintegrator with a square input cross section and a hexagonal outputcross section.
 4. The automated luminaire of claim 1 where the elongatedlight integrator with a square input cross section and an octagonaloutput cross section.
 5. The automated luminaire of claim 1 where thegobo carrier can articulate the gobos to rotate about the center of thegobo(s)
 6. The automated luminare of claim 1 where there are a pluralityof gobo carriers.
 7. The automated luminaire of claim 1 where there aremultiple elongated integrators each fed by multiple LED sources and eachoutputting light to their own light pattern gobos on articulatable gobocarriers.